A log collecting/analyzing system has a log collection terminal device as a client terminal device which collects logs and transmits the collected logs to a log server via a network. The log server receives the transmitted logs and stores the received logs for analysis. According to this configuration, it is possible to obtain useful information, such as information about what play modes are popular in the case of games and so forth, or information about what characters are popular in the case of selecting a character for a game. Therefore, it is possible to make use of the result of log analysis to develop the game.